Wrench.



A. A. MAXWELL.

WRENCH.

APPLICATION FILED.NOV, 26. 1935.

1 1 97,523 Patented Sept. 5, 1916.

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UNITED STATES rararrr onnien.

ALBERT A. MAXWELL, OF HUNTINGTON, WEST VIRGINIA.

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Application filed November 26, 1915.

To all whom it may concern Be it known that I, ALBERT A. MAXWELL, acitizen of the United States, residing at Huntington, in the county ofCabell and State of est Virginia, have invented new and usefulImprovements in lVrenc-hes, of which the following is a specification.

The present invention relates to improvements in wrenches, and an objectof the invention is to provide an ordinary monkey wrench with meanswhereby the same may be effectively employed for use upon pipes and toengage with the said pipes either upon the exterior or the interiorthereof.

Another object of the invention is to provide a device of this characterwhich will embody the desirable features of simplicity, cheapness andthorough etficiency.

With the above and other objects in view, the improvement resides in theconstruction, combination and arrangement of parts set forth in thefollowing specification and falling within the scope of the appendedclaim.

In the drawing: Figure 1 is a side elevation of a wrench constructed inaccordance with the present invention, Fig. 2 is an edge view of thesame, and Fig. 3 is a detail sectional view approximately on the line3-3 of Fig. 2.

The wrench may be of the ordinary construction including a stationaryjaw 1 provided with the usual shank upon which is mounted the movablejaw 2, the movable jaw being actuated toward the stationary jaw by ascrew 3. The movable jaw has its working face grooved longitudinally andthe side walls provided by the said groove having elongated openings 4through which pass pins 5'43, arranged upon the sides of the slidableauxiliary jaw 6 and this jaw is normally forced in an outward directionthrough the medium of a spring 7 which is secured to one ofthe edges ofthe shank of the stationary jaw. The jaw 2 has its edge opposite thatprovided with the auxiliary member 6 formed with an outwardly extendingrounded stud 8 which is adapted to be received in the rounded bore 9 ofa semicylindrical member 10. This member 10 has its rounded faceprovided with teeth 11 and 12, each of which extending in oppositedirections or at opposite pitches from the central portion of the saidrounded face of the member 10. The stud 8 is provided with a transverseslot or opening 13 through which is passed a securing element, prefer-Specification of Letters Patent.

Patented Sept. 5,1916.

SerialNo. 63,519.

ably in the nature of a cotter pin 1a, whereby the member 10 is retainedupon the stud. It will be noted by reference to the drawings that thesides of the rounded face adjacent the flat portion thereof are fartheraway from the pivot stud 8 than is the central portion of the saidrounded face, and therefore the member 10 may be described aseccentrically journaled upon the stud 8, and this arrangement permits ofthe said mem ber 10 performing a function which will later be referredto.

The jaw 1 is integrally formed with a'substantially semi-cylindricalgripping member 15, the straight face of the same being arranged flushwith the straight engaging face of the jaw, and the rounded face of saidmember 15 is provided with teeth 16 and 17 arranged at opposite pitchesfrom the center thereof, in a similar manner to the teeth 11 and 12 ofthe gripping member 10.

When the jaws of the wrench are adjusted to permit of the grippingmembers 10 and 15 being arranged within a pipe tube and the said wrenchis moved at an angle to a gripping position it will be noted that themember 10 will have a cam action upon its pivot stud 8 so that thegreater the strain in a gripping direction, the tighter the member 10will engage with the pipe, and as the teeth of both the members 10 and15 are arranged at opposite pitches from the center thereof it will benoted that the wrench may be revolved in either direction to permit ofthe ready screwing of a tubular member, such as a spindle upon a pipe orthe removal of the said member as well as the rotation of a pipe or tubein either direction. It will be also noted that the auxiliary jaw 6 willbe forced by its spring 7 into biting engagement with the pipe, rod ortube, when the wrench engages with the exterior of the said member. Itshould have been stated that the inner wall of the groove within whichthe auxiliary jaw is seated is disposed angularly with relation to saidjaw, and also the inner or contacting face of said jaw engaging with thesaid wall is likewise inclined or beveled, and thus it will be notedthat as the auxiliary jaw grips a pipe or the like the same moves uponthe inclined surface of the jaw 2 elevating the said auxiliary jaw tobring the same nearer the jaw 1, and consequently into tight engagementwith the ob- 'ect.

] From the above description, taken in con stud extending laterally fromthe slidable member in a line with the gripping element of thestationary member, a gripping member journaled upon the stud, saidgripping member including a flat face and a rounded face, teeth formedlongitudinally upon the rounded face, and means for removably sustaining the gripping element upon the stud.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT A. MAXWELL.

lVitneses:

W. B. HOCKENBERRY, D. E. RICHARDSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

